Changeset b5553a2 in mainline for uspace/srv/vfs

Timestamp:

2008-02-16T11:23:19Z (17 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

f17667a

Parents:

8ccd2ea

Message:

Introduce the notion of VFS node link counts.

Location:

uspace/srv/vfs

Files:

• vfs.h (modified) (2 diffs)
• vfs_lookup.c (modified) (1 diff)
• vfs_node.c (modified) (2 diffs)

uspace/srv/vfs/vfs.h

@@ -174 +174 @@
         vfs_triplet_t triplet;
         size_t size;
+        unsigned lnkcnt;
 } vfs_lookup_res_t;
 
@@ -182 +183 @@
 typedef struct {
         VFS_TRIPLET;            /**< Identity of the node. */
-        unsigned refcnt;        /**< Usage counter. */
+
+        /**
+         * Usage counter.  This includes, but is not limited to, all vfs_file_t
+         * structures that reference this node.
+         */
+        unsigned refcnt;
+        
+        /** Number of names this node has in the file system namespace. */
+        unsigned lnkcnt;
+
         link_t nh_link;         /**< Node hash-table link. */
         size_t size;            /**< Cached size of the file. */

uspace/srv/vfs/vfs_lookup.c

@@ -169 +169 @@
                 result->triplet.index = (int) IPC_GET_ARG3(answer);
                 result->size = (size_t) IPC_GET_ARG4(answer);
+                result->lnkcnt = (unsigned) IPC_GET_ARG5(answer);
         }
 

uspace/srv/vfs/vfs_node.c

@@ -149 +149 @@
                 node->index = result->triplet.index;
                 node->size = result->size;
+                node->lnkcnt = result->lnkcnt;
                 link_initialize(&node->nh_link);
                 rwlock_initialize(&node->contents_rwlock);
@@ -157 +158 @@
 
         assert(node->size == result->size);
+        assert(node->lnkcnt == result->lnkcnt);
 
         _vfs_node_addref(node);